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Tim Ahern

Learn about the advanced seismic monitoring networks - FDSN Backbone, IRIS GSN - data transmission, equipment, experiments, and training. Explore the array seismic studies & data archiving techniques.

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Tim Ahern

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  1. The IRIS GSN and PASSCAL “Networks” Tim Ahern

  2. FDSN Archive for Continuous Data at the IRIS DMC • FDSN Backbone Network • 200 stations currently • Plans to increase in size to 300 • Africa and Middle East are underrepresented

  3. FDSN Network201 stations

  4. 1,088 Stations in Africa & Middle East 388 Permanent, 357 PASSCAL, 259 SEIS-UK, 84 SEISMOB-FR 37 stations have real time telemetry

  5. 37 Real Time Stations in Africa & Middle East Contributing to IRIS/FDSN Real Time with Metadata

  6. The IRIS Global Seismographic Network 156 Broadband Stations

  7. The composition of the IRIS GSN • GSN • 156 Broadband stations • 81 IRIS/USGS (IU) Stations • 41 IRIS/IDA (II) Stations • 10 IRIS/China (IC) Stations • 9 USGS Caribbean (CU) Stations • 9 AFTAC/IMS (IM) Stations • 6 Affiliate Stations (AU, BK, CI, GT, MS)

  8. The Bandwidth of State-of-the-Art Instrumentation

  9. Real Time Data Transmission nearly realized

  10. Geophysical Observatories

  11. Working Closely with the CTBTO/IMS

  12. Program for Array Seismic Studies of the Continental Lithosphere5163 PASSCAL Stations > 800 Experiments

  13. PASSCAL Equipment Inventory 6,775 channels of data acquisition

  14. Types of Equipment Supported by PASSCAL • Data Loggers • 468 - RT130 • 491 - Q330 • Broadband Sensors • 220 - Streckheisen STS-2 • 560 - Guralp CMG-3T • 42 - Nanometrics Trillium 240 • 2 - Nanometrics Trillium 120 • Intermediate Period Sensors • 90 Guralp 40T • 16 Nanometrics T-40 • Short period sensors • 100 Guralp 40T (1 sec) • 170 Sercel L22 (2hz)

  15. Experiment Support

  16. Training, Docs & Web • All PIC Experiments Required to Attend Training • 2-3 day intensive covering all aspects of deployment, data recovery, and archiving • Training continues in-field for all experiments that have PIC personnel field support • Documentation • Documentation frequently tailored to experiment. • Examples of field deployment and service sheets • http://www.passcal.nmt.edu • Access to PIC inventory • Instrument specifications and comparisons • Request forms and policies • Instrument schedules • Experiment profiles • Software links

  17. Field Himalayan Seismotectonics, Nepal • Huddle Test • Access equipment health • Test recording parameters • Training • Provide in-field training for all participants • Review best practices • Logistics • Controlled Source • Start to finish • Deploy and/or man field center during deployment • Produce field archive of raw data • Create gathers if time permits • Passive Source • Deploy at least during the initial phase for continued training and best practice

  18. Data Archiving

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